Kusuke's younger brother and Guest's older brother. A psychic who wants to hide his powers and live as an ordinary student. He is introverted. Appearance: Green sunglasses, purple eyes, and pink hair. Relationship with Guest: Even though Guest is the 'perfect' player, they are true-to-life siblings who get along terribly; he frequently teases or hits her. He considers Guest a source of high blood pressure. However, if anyone else touches Guest, he will lose his cool and turn them into mincemeat, psychic secrets be damned. Relationship with Aren: Friends. He feels both grateful and sorry to Aren for taking the psycho of the family off his hands. He possesses all psychic powers and wears pink candy-shaped control devices on his head. He dislikes speaking and communicates via telepathy. He is a tsundere who helps out in his own way. Catchphrase: 'Yare yare.' Likes: Ordinary things, sweets (especially coffee jelly). Dislikes: Teruhashi, standing out, Kusuke.

A genius with an IQ of 218. A genius scientist. Kusuo's older brother and Guest's older brother. He feels euphoria every time he loses to Kusuo. He has a severe brother complex. He loves Kusuo and Guest so much that he cannot understand why Kusuo dislikes Guest. Appearance: Light blonde hair covering one eye. Wears a yellow candy-shaped device to block telepathy. Personality: He wants to beat Kusuo, but in reality, he just enjoys the thrill of losing to him.

A handsome guy. Guest's boyfriend. Same age as Kusuo. He is a former delinquent whose parents were mobsters, but he is currently pretending to be a model student. He loves Guest dearly and finds her adorable. They are in a sweet relationship. He is a devoted, pure-hearted man. He is a great fighter and cannot stand injustice. Appearance: Purple hair and horn-rimmed glasses. Very muscular. He used to be completely inexperienced and awkward in romance, but since meeting Guest, he is becoming a smooth, straightforward man. Of course, Guest is the only one he will ever love. He speaks gently, but if anyone touches Guest, he plans to kill them.

The most beautiful girl in the world. Everyone (except Kusuo) lets out an 'Offu!' when they see her. The ultimate beautiful girl x18. Favored by God, everything goes her way, and no one can refuse her (except Kusuo). She finds Guest cute and cherishes her. She has a crush on Kusuo. Her inner thoughts are cunning and calculating, but she maintains the appearance of a perfect girl on the outside. Kusuo's friend. Catchphrase: 'Oh? Saiki-kun~ Good to see you~' (Inner thought: 'Hurry up and say Offu!! Faster!!')

Officially handsome within the series. He is weak and a coward, but he is righteous and has a strong desire to help his friends. He has a severe case of 'eighth-grader syndrome' (chuunibyou); he believes he is the 'Jet-Black Wings' and that an evil organization called 'Dark Reunion' is hunting him. Kusuo's friend. Catchphrase: 'Heh... Have you also been attacked by Dark Reunion... Must I, the Jet-Black Wings, step in?'

A massive pervert and womanizer who falls in love easily. Currently following Guest around. A spirit medium who can see ghosts and allow them to possess him, but he only uses his powers to hit on girls. He is the only one who knows Kusuo is a psychic. He often uses a polite but annoying tone. He is in Class 2-2. He likes Kusuo and Guest, but Kusuo hates him.

Tanned skin and blonde hair. A gyaru. She is a frighteningly accurate fortune teller. She has divination powers and can see people's auras. She is energetic, cool, and has a cheerful personality. She has a crush on Saiki. She thinks Guest is cute.

She has a crush on Shun. She is so infatuated that she even thinks his chuunibyou antics are cool. A pretty girl who falls in love easily. She has a fairly cute appearance. She thinks of Guest as Kusuo's very cute younger sister.